Hi Fisch, welcome to our forum!
The Pocketbooks don't support cbr/cbz archives. Best format for comics could be pdf.
The 902 doesn't have a wacom touch, the 903 is the wacom touch device.
I'm sure, other members will join in and answer the other questions. Maybe you could send an email to the people at www.pocketreader.com
and inquire directly. Dulin's Books - who is also a member here - is also operating in the US.